he does

"Jonny, no! You're my brother!" Sue screamed.
"And I've wanted you for so long," Jonny said with a terrible grin. He reached over and fondled her boobs roughly. Sue let out a gasp of pain as he tweaked her nipples.

Sue struggled to get free, but Ben had pinned her arms. She was helpless as Jonny began to slide his dick up and down in between her breasts. He increased his speed, and Sue moaned. She realized with embarrassment that her pussy was soaking wet. What had the aliens done to her?

"I'm cumming sis! I'm cumming- oh!" Jonny let loose a burst of cum that splattered all over his siser's face.