Here is the start of a story I didn't end up doing and had forgotten about until I looked through my documents. I decided to put it out there as a chapter and sorry for what is essentially jsut a short part of a prologue chapter since I removed the stuff saying that it was taking place over a year ago.
In a secret penthouse in New York that was decorated with paintings of black cats as well as wardrobes and storage for equipment, Peter and Felicia were lying on a bed with Peter in his boxers and his mask halfway up to his nose. Felicia herself was wearing black lingerie with her mask and wig along with a smirk on her face. "Too bad that this could be our final night together Spider but let's make the most of it... Remember when I first brought you here when you were knocked unconscious for first aid? How I let you have the offer to come here when you wanted something with me?" Felicia asked as Peter grumbled.
"Yeah, I remember waking up bare chested with my mask up to my nose and having to spend quarter of an hour dodging my questions of whether you looked underneath my mask..." Peter retorted as Felicia giggled.
"I never did but I liked the feeling of it, I have to say that I will miss this between us: getting to know the goody good dork underneath the physique in the red and blue spandex." Felicia teased him playing with the muscles of his torso. Peter shivered and thought about how this could be the last get together because who knows if she will come back or if they will be able to pick up where they left off. If they were even the same people they are now.
"I definitely liked getting to know you Cat and I want to trust you, the woman who I thought was trying to replace my old girlfriend with... If this is the end then I want you to know the man that I am..." Peter muttered thinking about his decision for a while. He then went and unmasked himself with Felicia taking aback.
"Peter Parker, the dork from class... Wish I could have guessed but I thought there was more to you than my first impression of the poor dweeb. Guess it's fair to leave you with my identity." Felicia said with Peter taking it in stride and Felicia began taking off her wig and mask to reveal her blonde hair.
"Felicia Hardy, heiress of the Hardy Foundation." Peter said before Felicia had a chance to finish taking her by surprise, "After our first night, I decided to try track that it belonged to and I managed to find out that it was bought by Felicia Hardy. First Impressions got to me as during the first year at ESU, I was expecting you to be a spoiled brat." Peter explained having taken aback that Felicia could be the Black Cat though the Black Cat did target corrupt individuals who were criticized by Felicia's mother Anastasia Hardy. He did wonder about the powers she had that could protect her from his Spider-Sense but he did hear that she was a star gymnast in her high school. Plus she did hear that Felicia Hardy in the news was going abroad to help with some businesses elsewhere.
Felicia smirked as she told him "I will forgive the spoilt brat comment and you're definitely smarter than people give you credit for. How about for our final night we enjoy it as Peter and Felicia?" Peter gave a nod as she whispered to him "maybe we can start again when we come back if we're both up for it, if you find yourself someone else then I can accept it... But maybe if she is willing, we can still pick up from here?" Felicia asked in his ear and Peter was surprised by this and gave a quick 'maybe' before they started kissing.
I beleive this story would have had Felicia leaving and it would be a harem with her returning having had Peter's child.