You are a grown ass woman, targeting a minor (middle schooler probably) while having a thing with his brother. What. The. Fuck.
Frankly I wouldn't have minded this being longer and more emotional with its plot. It felt more dragged towards the end since the author is mostly very straightforward in their plots. Her other works don't have much unnecessary drama ig. If they had instead talked about how Ryuu felt about this whole thing and dealing with a household where his mom also probably doesn't seem to give a fuck about him, it would have had a touch more of emotional grounding. Because it does mess with you irl. Regardless, still a good read minus the family etc.
Also poor Ayumu, i felt so bad seeing him almost get attacked.