My junior coworker Aika Yumeno was in trouble because the water heater broke and she couldn't take a bath. Since she lived in the dorms, I offered to let her use the shower in my room. Just knowing that my cute, big-titted colleague was inside my room, showering, made my heart race uncontrollably. Unable to resist, I sneaked a peek into the changing area and saw her just after undressing—still in her underwear, her large, soft breasts on full display. The sight instantly made me hard. I tried desperately to calm myself, but after her bath, her sweet scent, wet hair, sexy nape, and careless choice of loungewear reignited my arousal. Being alone together in my room felt dangerously intense. I couldn't focus on anything, especially noticing how her nipples showed clearly through her clothes. Was this a sign? Was she tempting me? I became so flustered I couldn't even follow the conversation. Drunk and drowsy, I lost control—my hands reached for her breasts before I could stop myself. I braced for anger, for a slap, but instead of pushing me away, she weakly protested without resistance. That only turned me on more. I lost myself completely—fucking her, making her squirt, consumed by lust. Eventually, I came to my senses, but it was too late. Aika quietly left, clearly uncomfortable. I knew I'd messed up—terribly. At work, she wouldn't even speak to me. While I agonized in the bathtub, replaying everything, Aika showed up again—asking to use my shower.