She Contributes What She Can

My Brother in law and his wife sister in law moved in with us to save some money while they try and by a house. 6 months is what he asked for and I was ok with it. Right from the first day they where there I noticed my SIL was always in some revealing shorts and tops. It’s very nice to have around. I work from home and start my day early like 6 and stop early. I have free range of the house and with them the that had changed. My BIL is a driver and is gone most of the days. They paid a little money while living there we spent a lot of time alone. She was flirty I flirted back. She laid by the pool one afternoon in a very tiny bikini. She asked tan lines or no tan lines. I said no tan lines top comes off and she untied the bottoms. I was on her like white on rice. She gave me head and I have been fucking her since then. She told me she was a 3 hole slut and she confirmed it. She tells me it her way of thanking me. She thanks me a lot during the day. During conference calls she spends a lot of time on her knees thanking me.