Ok, this is called plugging
where I'm from. It would in fact get her pretty damn high being as the linging of the anus absorbs product very well, but it would only get you high a bit. Dicks don't absorb quite so well. Now I would absolulte make sure thhat you give it a second to melt inside too because if its a big enough shard and you go doing your thing you could in fact do damage to your girl, which is fucked up. It also causes microtears in the lining which is especially bad iif you guys do group shit or if either of you has ANY std. Be smart about it.
As far as the as pulsatinging goes, of course it is, you just stuck a very concentrated drug
into it. Its funny because, as I'm led to understand, it alters the way the brain receptors react to stimulation of the ass which makes it feel pleasurable. I know quite a few friends who don't mind a bit of ass play with their girls when plugging and booty bumps (disolved in a dropper) and plugging is huge with gay friends.
Believe it or not, below slamming the human body absorbs more of the chemical anally than any other method short of slamming.