Fics like The Sound of Your Heartbeat

“You’re in rut,” Bruce whispered. He read as much as the computer offered him. When Kryptonians are of age and become close to a suitable mate, they go into heat or rut. They become protective of their mate and need to be close with them during this time. They seclude themselves in a “nest” and have sex with their mate until the period is over. If one endures the period without intercourse, it is extremely painful. Oh. “You think I'm your mate…” Bruce trailed off. He thinks it must be a mistake, Clark is mistaking him for someone else. It said the heat is triggered when they get close to their mate, but there's no way Clark thinks of him like that. His crush is one-sided. That he knows for sure. There is no way Clark likes- “Yes! Mate!” Clark chirped. His head which had been buried in the crook of Bruce's neck lifted so that he could look Bruce in the eyes. “Bruce,” Clark moaned out. “Be my mate? Please,” Clark whispered as he leaned forward. -- OR Clark listens to Bruce’s heartbeat to calm down, but then accidentally finds out his secret identity and goes into rut/heat.

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