It is not something that can be planned for, and while it is occurring, I make every effort to just sit there and keep things casual.
I started bringing some food up to my lips and munching down on the quartered chicken salad sandwiches and mini pizza bagels I nabbed from her trays, all while watching my older sister Elsa work passionately on my dick. Elsa is sucking my cock by moving her mouth up and down.
Additionally, there is a characteristic that might be defined as one of extreme disinterest.
While she is sucking it like a zombie, she is not making any eye contact or groaning around my cock. She is just sucking on it without saying or grunting anything; she is just sucking on my cock.
Her head is bobbing up and down continuously as her mouth is at work to suck my cock off the load; she has apparently decided that she wants as much as the couscous salad she has taken a healthy helping of; she is sucking on my cock.