The Dashing Zaddy and His Icy Protege 2 by Fumito

An outrageous BL manga about work, unlikely friends, and problems down there! At age 40, Takanashi is in the prime of his life, heading up a high-performing sales team and driving all the ladies crazy. Yet he turns them all down, because he has trouble performing in the bedroom! What will he do when a rising star on his team finds out his secret?!

"I'll help you cure your erectile dysfunction!"

Takanashi, Itsuboshi Trading's flawless sales team leader, has a secret--He has ED, and it just so happens that the only one who can make his tower stand is his merciless and cold subordinate, Hiwatari! Yet rather than be turned off by this shocking revelation, Hiwatari--a diehard fanboy of Takanashi's--seems turned on if anything. Following a wild turn of events including a nude showdown at a bathhouse, Hiwatari makes a daring proposal that brings the two of them even closer together. Now, as Takanashi makes progress with his ED, it's Hiwatari's turn to work through his own shortcomings. Things heat up, and Hiwatari's icy exterior melts!