You'll be using the drugs as an excuse for banging her, and you'll feel really guilty about it for a long time, especially when your mate finds out about it and tells you to FO or worse.
If she's that horny for you she obviously doesn't value her relationship with him too much, and it will probably end sometime soon. Then you have a chance of banging her (providing your mate doesn't mind), but while they're together - no way!
__________________
Moo! I'm mooey!
|