Derrick and Jill are in love; Bin and Jessa are in lust. When Derrick and Jill look at each other, you can see the love. When I see Jessa and Bin look at each other, I see them thinking of ripping each others clothes off. They don't really talk to each other, they just give each other a sly look, as if to say, meet me in the broom closet in 10 minutes. I do believe Jessa and Bin have already kissed, although not for anyone else to see.