Alma was old fashioned. Raised into believing in the value of marriage, raising your children inside of them, that was the reason she'd stuck with Kurt, lied about Andrew's paternity, even to Bobby for months after his birth. It started to become apparent fast that he was Bobby's son.
She loved him deeply and she hated him for it. Hated him for not stepping up the moment she did divorce Kurt.
She was stuck there, starting to melt back against him as his hands moved on her until dull realization warmed her senses, she stood straight, pulling away from him. "At least let's get outta the open, Bobby, y'never know when someone could come this way."