I've been looking for it since forever and i just can't find it anywhere. Anyway, here it comes its plot (more or less likely):
Glasses-seme has received a coupon (to have some fun since he looked rather tired) from his clasemate and go to a place that was written on the ticket (i think he entered a love hotel).
Then the uke (a host?) appears and begins to unbutton seme's fly. Seme doesn't know what's happening (he probably wasn't aware what that ticket was for and where he was going) and so, seme runs off.
The next day? uke meets seme and tells him that seme is the first person who has rejected him so far. Then they go to seme's? apartment and so they start kissing etc.
Is there anyone who knows what I'm talking about?
Well, I hope so...

Could be Tenshi wo Otose chapter 4, maybe?

Quote from whitefox25

Could be Tenshi wo Otose chapter 4, maybe?

That's the one! Thanks a bunch big hug