MADONNA / DRAKE

Drake was not grossed out when Madonna planted a prolonged lip-lock on him at Coachella Sunday night ... his reaction was all about lipstick aftertaste.

Sources close to Drake... he loved the kiss. As for whether the kiss was prearranged, Drake says it wasn't ... the plan was for Madonna to dance around him while he sat in the chair.

Drake says he was not banking on a transfer of the glossy stuff and that's why he blanched.

When you look closely at the video, it looks like whatever lipstick there is it's pretty colorless ... either nude or beige.

During Drake's performance at Coachella on Sunday, the "Legend" singer welcomed a legend on stage when he brought out Madonna to sing with him -- but he didn't seem prepared for what happened next.

On Drake's most recent album, If You're Reading This It's Too Late, the 28-year-old rapper included a track titled "Madonna," which drew the 56-year-old pop diva's attention.

Madonna, who recently released her album Rebel Heart, was more than happy to appear on stage and give Drake a token of her affection. Namely, she began making out with him, much to the shock of the audience and to the rapper.