It's yaoi, but it's an old school yaoi where there're multiple stories in this series. This series had a 2 chapter story where, I think, a piano teacher OR tuner (seme) falls in love with the piano student, but due to issues, the student moves in with the seme and they fall in love. The most memorable part, to me, is when the seme asks the uke to join him in to sleep, and the uke has those hilarious wobbly-circled crying eyes (and he's chibi) asking if the bed is too small for the both of them.
The second chapter also contains an extra where the uke's older brother comes back and the uke becomes chibi.
There're 2 tops, one bottom. The tops are mythological creatures, and I'm pretty sure the bottom is human. They have children. The children can morph into their adult forms as wanted, and the tops can entrap them in ball-like things that we think hamsters use. I think one of the lines from the children to one of the tops is "can I suck milk from your titties?"
A warning for the content. Even though I don’t remember it, I’m partially sure it might upset others, but I need to know it to get my curiosity out. Details may not be accurate.
So, what I remember is a straight boy being caught having sex with a girl, and a gay boy blackmails him to have sex with him, and I believe it’s psychological because the top doesn’t enjoy this. The preview image/poster was the straight boy and the gay boy’s eye zoomed.

It’s a rivaling triangle. This guy who I think works as a butler meets with this yankee (Japanese sense), and though they don’t get along, they still meet each other. But someone from the household the butler works in falls in love with the butler, but that butler doesn’t reciprocate, so the guy stabs the yankee in the mall, and ends up in jail, while the butler and the yankee end up together.