SMuT

Acts as the concubine of the deceased son but still bedded by the father-in-law to make it act as she has his son's heir. They have seen each other before but v briefly just before FL's adopted grandfather died.

Kinda yikes, FL bro-con also has sex w/ him even tho she has a bf (omegayikes)

ML always gets an erection around women and FL finds out. She proposes she tries to "cure" him and that she takes care of him in work and physically (she has a fetish which he has)

Womanising ML set up for blind date with apparently serious and dead-faced woman but she defends him and he falls for her knight-in-armor self

FL fantasises about a man who rides the same train as her

Having gotten sick of boring men, FL wants someone more challenging to conquer. She gets transmigrated into another world and becomes the emperor's concubine. Extras are https://mangatoto.com/chapter/1923746

Having transmigrated as the FL's rival she tries to secure book ML's feelings for her but ends up falling for the side character. He ends up disappearing and appears next to her now book ML fiance.

Having been cheated on by her bf she goes to the couple spa w/ her friend instead (hot and a virgin)

Both sus, FL easily falls for ML's dick. ML planned for her to fall for him