Dawn couldn't believe she was fucking her best friend, but Rachel had become a true hunk. His dick was irresistable, and Dawn found her hips going through the motions on top. Eventually Dawn hopped off the dick and elected to go back to blowing Rachel. Rachel's dick had grown to at least 6 inches erect, and gave Dawn a mouthful. Rachel was just happy to have his new cock serviced. He was still into men, but he couldn't deny such pleasure.
Dawn felt herself changing, though. She felt her breasts shrink as Rachel fondled them. She felt the hair beginning to grow all along her body. Every suck left her feeling less like a woman, and she was loving it.
Rachel looked down in approval as he saw Dawn's tits had shrunken to a mere B-cup. Soon Dawn and he could be true lovers. Hairs began to spring up around Dawn's nipples and on her legs. Dawn, who'd been fingering herself, found herself changing the way in which she was pleasuring herself. A tugging had begun to occur as Dawn yanked on a newly extended clit.
Rachel pulled his cock away and planted a kiss on Dawn's lips. Dawn's face had begun sprouting stubble leaving a sharp and rough feeling as the kiss concluded. Rachel pulled away slowly to look a man in the face. He moved his hands forward and felt Dawn's strong chest with no tits left. Two large testicles dropped, and Dawn had officially joined the male sex.
To celebrate the occassion, Rachel dropped to his knees and began sucking off Dawn, leading to the first of many male orgasms the couple would share.