Onaholes are fun. Probably the R-15 (http://en-nls.com/pict1-3393?c2=12001110) or R-20 (http://en-nls.com/pict1-15738?c2=12001110) from Toy’s Heart are my favourites. The first one I ever used was the SI-X (Type F) by Toy’s Heart (http://en-nls.com/pict2-26184-9999?c2=12001110). It was OK, but too short and too tight. The R-15 and R-20 fit me better.

NLS (http://en-nls.com/index.php) by the way is the store I use in Japan for ordering stuff like that. They’re super discreet.