The first thing Bitty will do as a captain of the Samwell team is get rid of the disgusting green couch.
Dex, Nursey and Chowder are sent on an errand, as soon as they are gone Bitty uses the power of passing down dibs to have the tadpoles help him drive the couch to a dumpster, where he discretely bribes somebody with 3 pies to have the thing destroyed on the spot.
On the way back they pick a new couch from Ikea.
Bitty reign of terror (as called by Shitty and Holster) starts that day.
So I just want to point out that Magnus’ red couch seems to be in his bedroom due to the curtains and window ledge:
except the original bedroom set seems to not have allowed room for a couch, suggesting they might have widened it after the picture was taken or something? but anyway, given these two items, i just want to say that there’s a possibility, however distant, of Alec and Magnus making out on that couch and then moving onto the bed and continuing there.