A corrupting bite

With lightning fast reflexes, Tsuyu's fight or flight kicks in, and she chooses to fight. She jumps back and launches her long tongue out of her mouth, using its strong muscles to wrap around Midoriya with speed and precision. He tries to break out, and almost succeeds with his massive increase in strength, but suddenly he stops struggling.

"What are you doing?!" Tsuyu screams at him, hoping for an answer. She still can't believe what it looked like her friend was about to do, is he under someone's control? That's the only explanation she can think of for this kind of behavior.

Suddenly a stabbing pain shoots through her tongue, and she yelps. However she can't unwrap Midoriya, not while he's like this. She looks over and sees that he has his head down... Biting her tongue. Without his arms being free, this appears to be his only defense now.

She holds strong, and calls for help loudly, hoping someone will wake up and come to her aid. But the longer she stands there, the weaker she starts to feel. Her legs start to feel wobbly and her vision blurs. She can see blood from her tongue beginning to drip to the floor, as her friend sucks it right out of her.

Finally the standoff takes its toll, Tsuyu drops to one knee and her grip on Midoriya weakens. "What-What'd you just do to me?" She asks.

"I promise you'll feel better soon Tsu, this only hurts for a few moments." Midoriya gives an ominous word of advice, but Tsuyu quickly finds that his words may be true... She falls completely to the floor as her tongue retracts back into her mouth. She groans as the stinging pain in her mouth fades, leading to a growing warmth within her body. Midoriya walks up to her kneels down, his cock pulsing in his tight shorts as it fills her vision. "I can feel it starting, I promise you'll feel better."

Tsuyu moans out as the intense heat blooms inside her, quickly taking root in her soul as it begins to mold her body. She tries to back away from Midoriya, and actually succeeds as her strength returns to her. She moves back until she's up against the side of her bed. "What's happening to me?" She asks.

Looking down at herself, her body already looks different. Her breasts are noticeably larger and cover more of her vision, and she can feel more cushion underneath herself as her ass fills out. She closes her eyes tight and tries to fight whatever twisted energy is worming its way through her, but to no avail. Her skin grows a bit pale, her hair grows darker and more wild. Her ears elongate and grow to dull points, along with her sharpened teeth. Her nails grow hard and dark as she feels herself growing stronger.

She clenches her teeth as she feels a part of her soul die, claimed by the corruption now living inside herself. "Ooohhhh~" She can't help but moan, the heat inside her turns to pleasure as it begins to centralize in her newly enhanced slit.

She opens her eyes, blinking away the light in the room, which seems to bother her more than before. She looks around until her eyes land on Midoriya, specifically the large bulge protruding from his shorts. "Oh god~ Why do I feel so... good?" She can smell it, the pheromones from Midoriya's cock seem to demand Tsuyu's full attention. She begins to salivate, swallowing the accumulated saliva within her mouth.