the other starts with a little play with 6inch dildo first.......with lots and lots of lube, and im not small so she wont let me go in bum...would size effect her??
BUT, if you practice regularly with larger and larger toys, and if you warm up properly at the start of each session, and if you use loads of lube (preferably applied internally!) and if you're very, very patient and take things really, really slowly while doing your best to keep her turned on...
you might just get somewhere.
It's worth the frustration and patience, believe me.