Gotta be Luna.
Her calming, loving/nuturing personality is to die for. Also, shes just absolutely gorgeous.
Her body lines, curves, her mane, eyes...ugh..
Id do anything to spend a night with her.
Ohhhh. I have a slight crush on Luna, (a big one) so her first. More like cuddles. As for other hugs, all of the mane six, Starlight, uhh, nurse Red Heart too.