and after they had all paid their dues the second man felt he had more to give , so he pulled the girl up by her hair , propped her on her knees , slapped her lucid to ensure she maintained the desired position and came once more in an hungry mouth dutifully pried wide open by the powerful pairs of index fingers and middle fingers of the fourth man , who now realized he had wanted to do the same and was jealous of the second man for thinking it up first , for upwards thinking .