I wanted to cheat on my young girlfriend, but ended up having a threesome

My friend hasn’t had a boyfriend for a long time, and I have a stepbrother, but I’m greedy and won’t leave her alone. As a result, we both suck on our stepbrother’s dick, and when we get excited like the last sluts, we fuck both with each other and with him together. But overall it turns out to be a good threesome and a very fun one at the same time.