OMG I THINK I FIGURED IT OUT!

Great accomplishments for my Saturday: 3 loads of laundry and one FIGURED OUT J/D KISS!

Season 5 - Movements of Fire and Shadow. It's the kiss he lays on her after she agrees to go to the Grey Council and ask about the joint Earth/Minbari project for a destroyer-class White Star. The end of the discussion that starts with them talking about how he must've bought her lingerie. @ approx. 8:02.

WIN.