it's like "hey btw it's my birthday" 
 The idea of the birthday is okay I guess, but make it a bit more romantic: Eris crying and saying that she wanted to have her birthday with the whole family
Granted I do understand her desire to a family, but the way it was introduced was weird. It's like "damn, well I guess I'll make my own family then". It would have been ok if something like a month had passed they went through a little adventure, and at the end Eris would be like "I've been thinking about it for a while"
Moreover, the way she was drown is way too mature, I understand the meaning, but it seems like she gained 10 years in 1 day.
I personally hope nothing happens between the two of them because it came to fast