Kylo is an omega but had taken suppressants his whole life and never shared an heat with anyone. He's a virgin and never was quite interested in sex. He hide his omega status well from the First Order.
When he's captured by the resistance after the fight with Rey - he's going into heat. He's scared and skittish and does not want to have sex and does not know what is really going on (since he never experienced a heat before). Because of certain reasons (I don't know which - it is your choice) Finn is the only alpha currently at the resistance base and he has to help Kylo. Finn has never had sex before either and as his alpha instinct kicks in he get's possessive and eager and cannot resist the omega. Kylo is scared and fights him but has no chance against him (deep in heat and pain Kylo is, he cannot feel or use the force because of the heat). Later alpha!Poe comes back from a mission and calms Kylo down while showing Finn how to handle an omega in heat - being all tender and possessive, being like a real lover to Kylo. Poe is kind and considerate. Both Poe and Finn then sleep with Kylo. Kylo remains skittish and afraid during his whole heat (which last a few days) although he cannot resist the pleasure (and is disgusted with himself for it)
Bonus points for Kylo getting sick (as in vomiting) after the heat is over and feeling used and Finn and Poe helping him to the cleaning unit and helping him wash and patching him up whatever accidentally injuries he got because of Finn's harsh treatment. Bonus points also for addressing the consent issues.
alpha!Finn/alpha!Poe/omega!Kylo hurt/comfort a/b/o dynamic
When he's captured by the resistance after the fight with Rey - he's going into heat. He's scared and skittish and does not want to have sex and does not know what is really going on (since he never experienced a heat before). Because of certain reasons (I don't know which - it is your choice) Finn is the only alpha currently at the resistance base and he has to help Kylo. Finn has never had sex before either and as his alpha instinct kicks in he get's possessive and eager and cannot resist the omega. Kylo is scared and fights him but has no chance against him (deep in heat and pain Kylo is, he cannot feel or use the force because of the heat). Later alpha!Poe comes back from a mission and calms Kylo down while showing Finn how to handle an omega in heat - being all tender and possessive, being like a real lover to Kylo. Poe is kind and considerate. Both Poe and Finn then sleep with Kylo. Kylo remains skittish and afraid during his whole heat (which last a few days) although he cannot resist the pleasure (and is disgusted with himself for it)
Bonus points for Kylo getting sick (as in vomiting) after the heat is over and feeling used and Finn and Poe helping him to the cleaning unit and helping him wash and patching him up whatever accidentally injuries he got because of Finn's harsh treatment. Bonus points also for addressing the consent issues.