Orgy

Five or more consenting persons engaging sexual intercourse in the same place over the same period of time. Synonymous with group sex. Common props include drugs, alcohol, toys, etc. but are not neccesary.

Sex with Alfred, Arthur & Francis/FrUkUs: Threesome

Sex with Ludwig, Feliciano, Lovino & Antonio/ Germany, Italy, Romano & Spain: Foresome 

Hetalia: Orgy

For Lols Definition: when a bunch of people get together to trade STD's