Threesome and moresome sex positions are in a nutshell the same as one on one except there is the possibilty of being in more than one "position" at the same time. A little imagination is all it takes. Still animated images would be cool to look at for some.
"Light" bondage. Whether it is rope bondage or device bondage for the most part bondage sex positions are the same as "vanilla" or non-bondage positions. The thing about bondage is that in addition to the thrill of doing something dirty/forbidden/perverted/kinky/different the restraints often make it easier for the the "bottom" or bound one or captive to hold the position as well as giving the "top" or binder or captor some extra support or handles. I suggest the following book
Bondage For Sex Guide which is considered one of the best primers for light bondage. This will get you on the path to great kinky sex bondage sex.
While bondage clips would be nice I would hope that they were made with the consultation and approval of an experienced bondage educator.