>>961029
how can i fuck my gf ass?

>>962242
Talk to her about it. If you're worried she'll say no right off the bat, then bring it up slowly or subtly. Start a conversation about sexual fantasies and fetishes in general and lead up to it.
If you're to much of a pussy to do that you could also do what worked for my first girlfriend. Try going a little "off target" the next time you go down on her and see how she responds. Even that is just another way of bringing it up in conversation though. Call attention to it happening "accidentally" and then ask her if she liked it anyway. If so, keep doing it, later ask about trying more butt-stuff.
For the love of fuck, do not just go sticking something in or even prodding. That is a sure-fire way to have her barricade her backdoor permanently (unless it's her secret fetish too).

>>962242
Asking for Anon's advice on a non-existent girlfriend.

>>962242

If you don't want her screaming in pain? Get into ass-play. Buy a douche, a lot of lube and some small to middling toys. Get her nice and clean then start with the smallest toys. Might take a while before she can handle -you- though.

Of course, not everybody really enjoys anal.

>>963439
not even
buy some silicone based lube and trim your nails so they're nice and smooth
once you can get 2-3 fingers in your cock will fit easily