I'd not be surprised if the chance was slightly less than in normal intercourse.
There are suggestions that pleasure responses in women does increase the chance of conception. However... you'd probably find that research on this is likely to be, err, quite uncommon. Really, this speculation is more about the how/why of female orgasm... and it is just speculation as far as I know. (It's not my field at all).
When it comes to a single case... we should be realistic. There seem to be many-many of pregnacies that have come about through rape. In global conflict zones for example.
IMHO, only a crude insensitive fool would raise fertility in this context, with kids.
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