u/percpoints

Her entire life, Alison always wanted things that her father was too poor to offer her. However, after he gets remarried, she finds that the grass isn't always greener. The only upside is that her three step-brothers, Marc, Carter, and Archer, are there to cheer her up. They also have some birthday presents to help her celebrate her 18th in the most unexpected way.

“We thought that it should have been obvious,” Archer said with a roll of his eyes. “Do you know how long we’ve been waiting for you to turn 18? We’re patient men, Ally.”
“Don’t think that we haven’t missed the way that you’ve been looking at us,” Carter went on.
“All of us,” Marc chimed in.
“We were fighting a bit over which of us wanted to claim you for his own. Then we decided to let you pick.”

Lincoln brought Gina upstairs to his room, certain that they were alone. However, his step-mother, Molly makes the mistake of barging into his room without knocking first and catches them in the act.
As an apology, Molly invites Gina over and gives her something simultaneously embarrassing yet exciting. Gina realises that Molly is the kind of woman that she's always wanted to be.
Later, Molly barges in on Gina and Lincoln in the bathroom, and invites herself for a bit of fun.

It was wrong. Gina should probably push the older woman away. Tell her to stop.
“I’ve never been with another woman before,” Gina confessed.
“It’s okay. Let me show you how good it can be,” Molly whispered.