When we were just friends

"You are the one thing in my life right now that makes sense" Marco has one goal: break up with his not-quite sugar daddy by the end of the day. He's determined to end it as much as the older man is determined to keep him under his thumb. Luís is having a bad day. They usually know better than to stick their nose into other people's business but when they hear the man at the next table patronizing his young boyfriend, they just can't let it go and get involved in the worst possible way. The fact that the young man looks vaguely familiar is certainly a coincidence. And the attraction between them surely won't lead to anything. They could be friends at best. Just friends. But do "just friends" look at each other like that? Content warning:
the book includes depictions of narcissistic abuse, sexual assaul, attempted rape