I (33 bhm) have had this fantasy that arose during C19 lock-down when porn got boring. Can't shake it:

I am hanging out at someone's home, maybe watching tv or sports. After a short while he/she suddenly, whether I notice or not, starts touching themselves. At one point, they decide to go for it and take out their huge cock and start to stroke.

After I do notice, they move closer so I am within arms reach. A few times they feel the need to continue but must use both hands for something else and direct me to keep their stroking pace. He/she nonchalantly takes back over each time after the other task is done (ie, eating, smoking, texting). They then have some free reign, whether they want to stand over me and feel that dom power or take their time and make me watch closer. Even slap me across the face with it.

When he/she feels close, they choose their own fate: "Ask" for my helping hand or for me to offer my mouth as they stand over me to finish and fulfill their feeder fantasy. Even better if their girlfriend/wife was in the room or walks in during it and acts as if it is normal.