Taken from nksk twitter. He says something about some event, maybe a grand Prix?

R-18 http://twipla.jp/events/140343 に一枚寄稿しやした。　よければどうぞ pic.twitter.com/y466bmuwOr

I'd do some laps with Darjeeling anytime.

It's a little hard to tell what is going on with the monochrome image; to me it looks kind of like Darjeeling is straddling someone and there are a couple additional people mostly out of frame in the lower left corner, but I am not sure.