Technically, it is a kiss. So I guess it could count as a first kiss.
However, kisses come on a scale of significance. They are numbered - level 1, level 2, level 2+ and level 3
Level 1:- Your level one kiss is characterised by one or more of the kissers partaking in the kiss through a feeling of compulsion, with no other emotion attached. Example may be a kiss as a result of playing spin the bottle or any other game. This kiss essentially means nothing - or at least isn't supposed to mean anything. The kiss is just a result of someone playing along.
Level 2:- These are more challenging. They occur in situations where a kiss is not a natural consequence of the action. As such, some manipulation from one or more of the actors is required in order to ensure that the kiss happens. The important feature of a level two kiss is that there is no certainty of repeated kiss sessions and that the kiss may be followed up with feelings of remorse, awkwardness or both. A common feature of level two kisses is that intoxication is often a factor. A level two kiss may take place at a night club between two drunk strangers, for example. Where a kiss in these circumstances takes place between people who know each other, it may fall into level two plus.
Level 3:- The most significant kiss. Between two lovers. No more needs to be said.