<human>: Fake names, throwaway, usual.

I have sole custody of my son. I'll be the first to admit that I'm very protective and paranoid over Damian, but I don't think I'm overreacting in this instance.

I'm friends with a group of people in the same major as me. The girl in question, Ivy, is a recent edition to the group and is a bit immature, but she's very friendly and nice to hang out with. She tried flirting with me in the past, but I firmly rejected her and she seemed to have gotten over it. We've known each other for about a year.

Recently, they all hung out at my place for a bit. Obviously Damian was there, and met Ivy. Ivy was instantly smitten, because Damian's adorable. Her behavior since then has been really off-putting.

She constantly asks to babysit Damian and pouts when I say no, thinks Damian should come to every study session or hang-out (even ones later at night), wants to talk about him constantly, etc. One or two girls before have tried to be Damian's 'mom' and my response has been icing them out of our lives, but this is a lot more complicated as she's integrated into my main group of friends. I've mostly just not responded to her when she talks about Damian, but I'm looking for ways to shut her down permanently without getting everyone else involved.

Summarize the given text in a few sentences.
<bot>: Looking for ways to establish a firm boundary between my son and my friend who seems to want to be his 'mom.'