初めましてストーンさん、管理人の山口と申します。
おそらくEvil Angelにご登録の際、決済画面（カード情報入力画面）において、抱き合わせのチェックボックスをオンにしてしまったため、21sextury.comも購入してしまったのだと思います。
2通届ているとのことですが、21SexturyはAdult Timeの一部ですので、アカウントは一つです。1通目は『21sextury.comの購入』メール、2通目は『Adult Timeへのログイン案内メール』になります。
どちらにしてもすぐに解約処理は必要です。別途メールをお送りしておりますのでご確認ください。

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JUN

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3 day(s) subscription at 4.95 USD that will automatically rebill every 30 day(s) at 34.95 USD.

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以上の2通のメールの意味が分かりませんし請求されるのか心配なのです。
どうぞ宜しくお願い致します。

初めましてれいさん、管理人の山口と申します。
二つのサイトに登録されて、そのどちらも解約し、それでも二つ課金され続けているのであれば、両方で抱き合わせサイトを購入し、その課金が続いていると考えていただいてほぼ間違いないと思います。どちらのサイトもGammaEntertainmentが運営する決済会社なので、どちらからでもサイトにアクセスして、メール、電話、ライブチャットのいずれかで、課金されている金額、日付、カード番号、お名前、カード明細、可能な限りの情報と解約したい旨を相手に伝えてみてください。大手なので問題なく解約できると思います。