Jaskier's always been a poorly omega, often need the Omegan Services to send someone out to help him. Geralt's known the omega for a bit, through Yennefer, but had been the only one to offer to work in the omega's neighborhood. He's gotten to know the omega much better since. However when he gets called out and Jaskier's and the younger man is sick? Well Geralt's always been a bit of a service alpha anyway. He'll chalk the way his heart flutters and his mind get all those good alphan hormones to that. But not for long. (Tw stitches, medical, smut in the beginning)