When a female gives one male oral sex then right after shes done goes and kisses/makes out with another man. So basically it's kinda like the first guy's dick is in the second's mouth hence "dick-to-mouth".
She was in the room with Dan for quite sometime, then when she came out she was making out with Sean. I am willing to bet that Sean got some dick-to-mouth there.
#dick-to-mouth#dtm#dick to mouth#oral sex#making out