Hey, Hyao? Will we ever get a Bernard x B!Logan or even a Bernard x B!Logan x Caleb event at the barn? You could make it so like if the Player has already done Bernie's "More Potions" quest for the first time and then he runs out of Restrain Potions maybe for a week or so after the Fullmoon quest is also done.
(Reqs could be like: finished More Potions 1st time, finished Bareshade Exp, found Caleb and unlocked Gloryhole, B!Logan, B!Logan x Caleb done, and then Player has spent time away from Bareshade for a week or two- leaving Bernie out of of options -and potions, and I think Bernard x Player x Caleb should also be done so Bernie would comfortable or at least would have experience with this kind of coupling)
His werewolf instincts, despite being in control, would put him in a rut though nothing too ragey or out of control but just enough to make him slightly horny. So now in comes Caleb, who would encourage Bernie's urges. Then Caleb suggests a "willing hole" that he regularly taps. So enters B!Logan, like literally, he enters the barn in the scene, ready for that werewolf dick but tries to leave when he sees Bernard (Player probably hides to avoid being seen). But a few encouragement from Caleb to both of them and... spitroasting ensues. Maybe you could also make it as a random scene for Caleb and Bernie in werewolf forms fucking B!Logan and another with Bernie just human but still horny and spitroasting B!Logan with Caleb. So two rng scenes.
Player just watches though after he/she comes back from travelling. (Like a normal Caleb x B!Logan event)
Post scene could be like Player mentioning this to Bernie at his store as a dialogue option and Bernie apologizes, then admits that he smelled you watching them but couldn't stop himself. You could give player options to encourage this as a weekly behavior and watch / admit you are jealous and stop this behavior by giving him restrain potions / ask to join next time lol. Well... you'd probably have to make another different scene for that last one so maybe just the 1st and 2nd option would be fine.
Just a suggestion though, no biggie. You can ignore this haha. Just my... horny imagination getting the best of me. Probably should just write a fanfic about this lol.