Moonwater who accidentally bump into each other in the prefects bathroom every month. Remus goes in there to soothe his aches and pains near the full moon and Reg who does the same when it’s his time of the month.
And they’re both so stubborn like at first I imagine regulus walks in on Remus and Remus leaves. Quite grudgingly. The next month, Remus is having really bad pain and Regulus just assumes he’s also trans and that they’re just syncing up. So he’s like whatever, let’s just both stay.
And undresses in front of Remus because he thinks Remus is trans. Remus is soooo embarrassed at this cute boy undressing in front of him that he closes his eyes. Reg “not like it’s anything you haven’t seen already, but whatever. I’m in now, you can open your eyes.” Remus who gets hard just seeing Regulus’ shoulders. They sit in silence and when Regulus goes to get out Remus shuts his eyes again. (He can’t get out first because he doesn’t want Sirius’ little brother to see he’s hard.)
This happens every night that week, and they sit in silence. Eventually they get more comfortable and start reading their books in the tub, and start talking literature (god I love nerdy moonwater).
On the last day that Reg plans to be there until the next month, he lets Remus borrow one of his books that he’d mentioned wanting to read. So over the next month whenever he sees Remus around Hogwarts they share small smiles and he sees Remus constantly reading it.
Remus putting sticky notes with his thoughts on all the pages refusing to write in the book.
The next month he returns it with all his little notes and that whole week they talk about it. Remus goes to the bath for the few days before AND after the full. This moon was particularly bad on his joints, and even if he doesn’t get many scraps and cuts anymore thanks to the Marauders he’s in tons of pain.
The day after the full, regulus notices how in pain he is and how he can barely move and he washes his hair for him. Maybe gives him a shoulder massage.
Talks softly to him about the book he’s reading or maybe even reads TO HIM.
At the end of the week, Remus gives Regulus a book to read and the same process happens. Sticky notes, eye contact, HEAVY tension. Reg begins slipping notes to him when he can about his thoughts on the book.
Next month they’re sitting there again and Reg is in terrible pain. Remus washes his hair, it’s terribly domestic. Remus definitely thinks Reg is a werewolf.
Idk how he brings it up. I think it would take him a while to get the courage. Or maybe Reg brings up being trans first. I think that could cause some good angst because Reg would say something about how horrible periods are and Remus would be confused and Reg would think oh my god I’m wrong? And be embarrassed and feel awful and think he’s been betrayed basically. He’s definitely running the fuck out of there.
The next month is filled with them staring at the each other all the time. Remus tries to talk to him a couple times but he refuses. Full moon rolls around and Remus doesn’t show up to the bathroom, which makes Reg think he was fucking with him. Until he learns that Remus is in the infirmary, possibly from James or Sirius. This could be after the prank for maximum angst effect or not.
Regulus realizes Remus is a werewolf. Like putting it all together. That he wasn’t lying or faking anything. When Remus is out of the infirmary Regulus passes him a note saying to meet him in the bathroom, which it isn’t even a full moon and Remus is so confused because at this point Regulus has avoided him and now he’s going off script.
Either way, he goes. Regulus is already lounging in the tub just his head visible above the bubbles and tells Remus to get in, but Remus asks wtf is going on. They have it out with Regulus lying naked in the tub and Remus fully clothed just standing there. A lot of confessions happen. They open up about life as a werewolf and life as a trans person. Healthy communication OF COURSE. They would find it really funny, afterwards.
Remus would probably make a joke about them being like one of the couples in their books they shared (a couple that had a silly miscommunication then fucked crazy style about it afterwards) and Regulus would pop up out of the water JUST enough to show his shoulders and he’d lean over the side of the tub and say “oh JUST like them?” Remus would blush at the implication and probably get half hard just seeing Regulus’ shoulders again. He’s a simple man.
Regulus ends up telling him to get in again, and Remus flustered and embarrassed is like “but I have to ??? Take my clothes off?? If you could uhhh look away? If you want to not see that???”
Regulus is like maybe I want to see you strip for me?
so cut to Remus who is so so embarrassed and flushed and shaking a little starts to strip while Regulus watches him sooooo hungrily. Remus obviously has a huge dick btw, but we all knew that.
Regulus just stares at him the whole time practically drooling, especially when he sees Remus' huge cock. Regulus "are you all hard for me baby?" Black.
When Remus gets into the tub Regulus is on him IMMEDIATELY like I know he wouldn't be able to hold himself back. Remus submissive top Lupin who lays back against the side of the tub as Regulus power bottom black rides him until he comes inside him, and then continues riding him until he gets off, making Remus come again. Remus being a cute overstimulated mess and Regulus calling him his good boy with the huge cock and humiliates him WHILE praising him like "oh you're so dumb for me aren't you baby? just gonna lay there and take what i give you right? my big dumb baby letting me fuck myself on his huge cock. you don't even know how to use it, need me to help you, don't you baby?"
Remus would just nod and agree and beg for Regulus to use him, with tears in his eyes from how good it feels and how overstimulated he is.
anyway yeah itd go something like that
