Onahole + Eromanga collaboration
The eromanga Onaho to omocha to costume by Ikuya Daikokudou featured a character called Nahotan, the spirit of Onaholes. Now the author has updated on his blog revealing that they’re actually planning to release a real onahole based on Nahotan. (with two other onaholes based on his other manga)
Onaholes are… known as Fleshlights in the US apparently. Though it’s kinda strange that according to the wikipedia article it got a patent in the US in 1998, when it had been in Japan for much longer.