At the tip, of course!

Sarah moaned, "At the tip!"

Tom smiled and leaned over, licking the tip of her cock. The strange texture and odor had him so horny he could hardly stand it. A large drop of precum began to ooze out of her urethra. He smiled again, knowing what he had wished. Everything was going to be perfect. He brought his face close to her cock head and licked that pre. It was salty and strange. She gasped and stamped her back hoof.

Sarah was kneading her breasts and twisting her nipples. Her cock was so hard it hurt. Her pussy was dripping wet and now Tom was teasing her. She moaned and shifted a little as Tom played more and more with this new part of her body. The feeling was alien but so, so pleasurable.

Tom kissed that cock, feeling somewhat uncomfortable. He started jacking it, smearing the smegma up and down the shaft. Sarah moaned again as a fresh stream of precum came out of her urethra. He smiled, knowing this would be worth it.

Sarah felt her cock getting stroked. She twisted her nipples again, picturing her perfect lover. He was a Centaur like her. She teased her nipples again and imagined her lover having breasts as well. She imagined if her lover was an hermaphrodite and with the imagination and the stimulation she came hard. Tom was unprepared for the shift in reality as well as the torrent of cum.