
Is this also another love triangle? 3 out of 4 are love triangle from this author

It's not a 3P. More like fuck buddy situation turned to accidental voyeurism.
SPOILER
A kid has a crush on his best friend. The friend met a fuck buddy (Mr. K) on internet.
The kid followed his friend to the Mr.K's house, then they both proceeded to use that guy's house as a love motel, while the K sat back gave advice like a bored councillor earning $15/hr.
Half way through he went to make popcorn and watch Avengers or some shit (something more interesting than two virgins fucking on his bed, idk).
Reverse harem?