Craig is hired to pet sit a "rabbit" but instead finds a tied-up Tweek in a closet. This is inspired by the OVA Sensitive Pornograph:

Tweek tells Craig his master is watching them and expects them to fuck. They both end up liking it and start developing feelings for each other, and when Craig leaves, "bunny" Tweek realizes he deserves better and stands up to his master. When Craig shows up again, Tweek's been beaten to shit but asks Craig out

Master as Richard Tweak preferred but it's up to you