Caught

My auntie is hot as fuck i spend a lot of time at her house and get to see her sexy underwear,I was feeling horny and decided to have a quick wank upstairs in her bedroom I've never done it before using her knickers but done it this time with her black silk ones i put them over my cock and closed my eyes and off i went it went on for only about 5 minutes when i started to cum it was only then i opened my eyes to see her watching me and couldn't stop i was embarrassed her underwear she caught me and her underwear covered in cum she gave me a wink and said to put them out for wash she wasn't made which made it worse because i got aroused again i think more could happen just not sure how to approach her any tips??