Slowly and gently I massaged her tit finding her nipple under the thin nightgown I played with it feeling it grow into a rigid nub.
Mom and Dad went out for the evening, leaving a phone number in case we needed to reach them.
Her hand reached my stiff cock.
As I cummed I held her still on my exploding erection as she laughed "Did I just make you cum".
She seemed to want more.
This exposed her soaking wet, blue panties.
All 3 sisters are elder to me and eldest one has a boyfriend and we all are cool about it.
I got over excited and caught her handssat on my knees and proposed her.