Erotic auction

Give each other a set number of “points” or fake money at the start. Then one partner can “bid” those points to get something (“I’ll pay 5 points for a foot massage”). The other can accept and perform it to earn those points. Then maybe they bid for something (“10 points for you to go down on me for 5 minutes”). It becomes a playful negotiation where each sexual favor has a price. You can end with the one who spent the most points “owing” a fun penalty or the one who earned the most points getting a special reward. It’s a lighthearted way to articulate what you both want.