It's about four school boys that went on a school trip. The uke secretly had a crush on his friend (the short dark hair one) but his 2 other friends (the tall dark hair one and the tall light hair one) found out and they end up having a threesome on the night of the school trip.
In the next chapter, the tall light hair guy confess to the uke that tried to avoid his face, they end up banging on the school rooftop.
(=・ω・=)