Man, this is a twist off a classic Hendrix riff except he'd be picking each note (instead of hits and pulls) and be going back down to the B (12th fret) before doing the bend up to it on the G string (Voodoo Child & original Redhouse).

What you've gotta do is play each note (including the bend) equally with respect to time - ie. do the riff as a triplet. Don't hold the bend, just use it to go back up to the B on the B string ala Johnny B. Good.

Hendrix didn't use his pinky ever except for the odd double stop and if that's the case for you then you play the 12th fret with your first finger, the 15th with your third, and then the bend with your second. ... If you use your pinky then the 15th is the fourth finger and the bend is the ring finger.