Feederism

[Britney]

An underground sexual fetish which involves one partner (the [feeder]) feeding the other, both to obtain sexual arousal and to encourage weight gain in the [feedee]. Feederism can vary in nature, from a consensual act between two people who mutually appreciate a larger body type, to non-consensual abuse, which may involve force-feeding and bondage and is undertaken with the intention of fattening up the feedee to the point of immobility and total dependence. The weight gained can also vary froma few pounds to hundreds, whilst some feeder relationships are not undertaken with the purpose of weight gain at all but for the enjoyment of food in an intimate context.
Most feedees are female ([BBW] or [SSBBW]) whilst the feeders tend to be [FA] males, although this is not the case, and gay/lesbian feeder relationships are not entirely unheard of.

[Britney]

Feeding fetishism: sexual gratification stemming from feeding oneself or a partner to obesity!