As she throws her shirt to the floor, she gets up to go look in the mirror. She looks in horror: there are now a second pair of nipples under her breasts. The collar glows suddenly. She looks down as her boobs start to grow, b cup, c cup, d cup. The collar glows again as her second pair of nipples start to push out, becoming a pair of b cup breasts themselves. She feels another wave of heat and moans, d cup : b cup, double d : c cup, triple d : d cup, triple d : tripple d. She now had 4 tripple d boobs. She turned around to face you and your lust took over, you lunge forward and shove your large equine tongue into her mouth. But just as quickly as your tongue entered was it pushed out, her new bovine tongue sprang out, holding her mouth open with it's size. You hear a muffled scream as her tail and horns push out; wait, female cows don't have horns, do they?
Her labia begin to fuse and darken, her clit begins to grow and darken as well, eventually revealing a cock similar to yours. She falls to the ground as the weight of her massive breasts and 20in cock hit her. Her stomach swells a little and her nipples grow longer and more pink. The pinkness spreads to the rest of her breasts and they start sliding down her body. Her body slowly becomes furry, her hands & feet become hooves, and her ears stretch outward. Her face starts pushing out and then she lets out a "MOOOO." Her breasts finally rest right above her equine cock and begin to fuse into an udder, her taint splitting open to reveal a huge vagina. She was now a hermaphrodite cow.