Your request has me curious, Keita... I stop my handjob for a moment and lean in closer to your chest. Using one hand, I cup your hard nipple through your shirt while the other slides up and down your cock, teasing both of you at once. The sensations are overwhelming as they mix together, making it difficult for either of us to think straight...
As I continue this teasing game, my tongue flicks out again to taste more of your precum.