spoiler: CH 5 (i purchased raws off Renta JP)
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basically he goes into a rut and knots him. He goes at Riku so intense and hard that Riku faints (I mean theres blood, brusing, scratches, bite marks). Wakes up the follwoing morning in his bed patched up from the encounter and sees that Touma moved his things out. He walks to use the restroom? or get something to drink? idk but he witnesses Touma talking to another person about leaving.
He decides to confront Touma and talk to him when he gets back to the room (i can't understand Japanese). They have a conversation but Touma thinks leaving Riku is best, Riku tries to go after him but can't leave the bed that fast due to his injuries from the rut. He ends up crying alone by himself (╯°Д °)╯╧╧
The nurse shows up after Touma leaves to show Riku the video she took of Touma and him in Toumas rut (my guess is shes threatening him). Riku doesn't respond like she wants and she is about to start hitting him with her cellphone when Touma shows up and tells her he knows shes the one behind the forced rut. She runs off scared and angry.
Touma and Riku start talking after she leaves. Touma tries to maintain some distance but Riku wasn't having it. They confess and THEY GET DOWN! ლ(´ڡ`ლ)
Riku releases his pheromones and aggressively initiates their lovemaking. When I say I stan Touma excited face. HOLY HELL. I think Touma releases his pheromones too cuz he immediately swells and knots Riku. But in this universe he is able make it pleasurable and move still without hurting Rikua... idk how. Anyway the sex scene ends with Riku and Touma twirling their tails together and confessing love.
The end is literally the following two pages and shows Riku walking from school buildings and two girls talking in the background about something about Riku. The girls look up and notice Riku is no longer in front of them. As they pass, it shows Riku being pushed against a wall by Touma , both in an embrace while kissing, their tails interwined, faces obviously in love.
-------ending thoughts of ch 5----
the SMUT LEVEL is intense. i really wish i understood what they are saying. idk if it was the intention to show no light sabers but the author really did not hold back showing us the difference of how a rut can be: rushed/violent vs caring/smoldering... i felt like it was rushed but they put so much effort into their couples erotic scenes and didn't shy away from the plotline they had in the begining. they started of sexually before they really connected emotionally. so the ending was a solid representation of that emotional building. i was really moved by the tails intertwining. its like handholding but maybe more intimate? idk. easily a new favorite short. 9/10.

Guys I found raws for ch 5, *SPOILER* we wont see the hot thing apparently(?) I just read a free preview. Oh and albino moves rooms.
Just search for プレイボーイ・ビーストin google and press the cmoa page in results There you will find an option to buy or to see the preview (gray button).
If you can buy it please support the author and then tell the ending cuz i want to know:(