My sister loves me and will do anything to please me. Recently, she has escalated from handjobs to blowjobs! What's more, she appeals to me with her blowjob techniques in front of our parents, which makes me nervous! Regardless of my feelings, my sister whispers to me like a devil, "Don't you want to do more naughty things?" With a mischievous smile, she says, "It's in," crossing the forbidden line in an emergency! No! But it's too late... I've already ejaculated.