Fics like a dose of oxytocin

oxytocin: a crucial hormone and neurotransmitter, often called the "love hormone," produced in the hypothalamus and released by the pituitary gland, vital for childbirth, lactation, and mother-infant bonding; also involved in social bonding, trust, stress reduction, and sexual arousal. or: Bruce and Kal were well aware that kryptonians could change human anatomy after prolonged contact. A basic instinct, a need to survive and procreate. They just never thought it would happen to them. Until it does.

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