Responses
The only one that comes to mind is this one.
https://www.mangago.zone/read-manga/bokura_no_mitsudomoe_sensou/mf/v01/c002/
YEEEES IS THIS ONE THANK U SOOOO MUCH ILY
was it about guy A who was in love with his cute friend and was mad at guy B who was trying to date his cute friend? anyways in a chapter guy A, guy B and A's friend (not the cute one) fuck when the cute guy was sleeping (they were on a trip)