I don't think that you are selfish because you want more time. I would also in that situation. I mean, you had him as much as you wanted while she was away.......now you're down to one night a week? Boooo on that. LOL
But again, I understand she just got home and needs that one on one time with him, but hey, you do to.
They are in YOUR house? Wow. I didn't know that girley. I bet you are ready for them to close on the house so you can get some peace huh? LOL! Just kidding, I'm sure you are having a good time with their stay.
You must be a people person to walk into a relationship with 4 kids. LOL! I'm sure it's going to make you feel so great to meet those children.
Make sure you update when you do get to meet them! I can't wait to see how they respond to you, and vice versa.