Sweat runs down Liam's chest as he pounds into you, your increasingly large body making it difficult for his still human frame to handle. With each thrust he makes, you feel your neck stretch and thicken, the bones within popping and your muscles spasming and bulging as they enlarge.
Your breasts begin to feel increasingly heavy and pendulous, swinging with each thrust and slapping against your distending belly. You watch in the mirror as they start to drift downwards, your chest broadening outwards behind them as muscles surge beneath your now entirely hair coated chest.
Your swelling breasts gradually darken to a chocolate brown as they stretch downwards, and you realize with horror and fascination that they are becoming equine udders. With a final sickening surge of growth your nipples stretch downwards as they elongate into teats, your human breasts now fully transformed.
Your new udders now hang between your rear legs, their dark brown flesh bulging obscenely as they gently press into your inner thighs. The sensation is too much, driving you over the edge as you orgasm a second and final time as Liam roars and slams his hips home, his cock pulsing as it starts to ejaculate a torrent of hot equine cum deep into your transformed cunt.