The Punishment for Forgetting to Bring Cycling Shorts

The junior and the senior agreed to pick a day to practice cycling together, hoping to improve their speed.
But unexpectedly, the junior forgot to pack his cycling shorts the day before...
「We can't go out like this, so let's just train at my house.」
「...? Senior's house?? How are we going to train?」

Unexpectedly for the senior, the junior seemed to really enjoy this type of training, as the bulge under his tight compression shorts became more and more obvious...