If you're still inside...

"Well, your cock is still inside of me. That's for sure."
"Yes. That's good, right," you ask.
"It's very good- for many reasons. In this case, it means that you never stopped fucking me the first time. We're good to go."
"I like how you think."

You rub Fifi's ass.

"That's my cue. Have fun, Mom. I'll go out for a while with Dad."
"Bye, dear."

Fiona exits and you turn your attention back to her Mother.

She pulls you down onto her for a long, sensual kiss.

"I want to be on top now," she says, guiding you to roll over.
You happily go along with it, with the MILF (now in past tense) now on top of you.

She starts to fuck you, letting you enjoy her pussy from a more comfortable angle this time.

You take this opportunity to play with her tits.

She smiles happily, enjoying the attention you're giving her.

After a few minutes, she cums again.

Your own orgasm is near, so you need to decide what to do.