[swuglyfe]

In all seriousness though, don't buy them something physical. Give them some sort of experience. Doesn't have to be fancy or expensive, as long as it's personal. She will move on and fuck a bunch of other dudes, and they'll probably splash cum on the teddy bear or whatever you bought for them. But, as Menace so aptly put it that I decided to make it part of my signature, an experience is in her head and no guy can ever jizz on it. Especially if you give her good enough sex, you want every guy after you to fucking hate your guts because she's judging them for not living up to the standards you set.

That's a damn good gift to leave with them.