There's a Rat in Our House - Vol. 1 Ch. 2

[MangaDex]

 

[EchoGirl]

lol the title being 'rat' (despite the alternate being 'mouse') makes me think he might not be so innocent versus her just taking him in as a porn with plot kinda manhua/kept man series XD

Tho i imagine if he's not an orphan he's prolly kicked out or just has some sad traumatic past/backstory as opposed to it being like a wholesome adoptive series tho i hope the power dynamic isn't too bad with there being a twist with the fem mc being some kinda sociopath