Sis giving hints?

FYI me m(21) my sis(f20)

My sis started to go to the gym which led her to wear more revealing clothes around the house. But she also started to tease me with it by brushing her body close to me by accident or bending over Infront of me, I found it really hot. Eventually one day we were home alone and my sis was wearing gym tights and a small tight top and i was sitting at the couch staring at her which made me hard and she noticed me being hard. She came up to me and said, "Should i help" and giggled and I didn't refuse. She got on her knees and began sucking which led us to fucking. Gosh that was the best sex I've ever had and Im looking forward to more regular with her.