Sure! That sounds great. As long as she has patience and is willing to stick around even when he blows up, I'm sure they can be good friends. (He's starting to be surrounded by all the women. Not bad, Fenrir. Not bad at all.)
Established friends sounds wonderful for Aengus. He's a social guy (unless it's during his writing time), so he likes having friends to talk to. He doesn't have a loud personality like Monte!Eros, so I think he's easier to be friends with. And! And! He won't play with Iamus' love life!
She is free to Isis him. Because that means attention from a beautiful woman. Only occasionally? Phobetor will have to try harder, then.