The male Charizard, the female Pidgey and Peach's Castle are respectively from Nintendo's Pokemon and Super Mario 64 and this screenshot's taken from Valve's Garry's Mod.

The ladies man Charizard has enjoy spending time with the adult female Pidgey during their latest date and it looks like she's enjoying it so much, thanks to her belly feeling much lovely and bouncy from many fruits he bought for her. She many not be able to fly, but, at least she can still walk, though. In the meantime, he's now giving it lots of rubbings to impress the birdy lady.